Definition:
Wheeled equipment for carrying goods, such as a truck, trailer or semi-trailer, rail wagon, which can be driven or towed onto a vessel. Live animals on the hoof, port or ships' trailers are included. Vehicles being transported as cargo as opposed to a means of transport for freight or passengers are excluded.

Low-level terms:

• Roll-on roll off (non-self-propelled) unit
• Ro-ro unit, self-propelled